Skip to content


Your cart is empty

Article: What Size Undershirt Should I Wear: Undershirt Size Guide

What Size Undershirt Should I Wear: Undershirt Size Guide

What Size Undershirt Should I Wear: Undershirt Size Guide

Your undershirt is the foundation of your outfit, and getting the right size is crucial for both comfort and style. If you've ever struggled with finding the perfect fit, you're not alone. In this comprehensive undershirt size guide, we will demystify the process and empower you to make informed decisions about what size undershirt you should wear. Whether you're a busy professional or someone who values personal appearance, our expert advice will help you achieve the ideal fit and feel. Say goodbye to guesswork and hello to a wardrobe staple that enhances your confidence and professionalism.

Why Undershirt Size Matters

The size of your undershirt may seem like a minor detail, but it can have a significant impact on your overall appearance and comfort. Wearing an ill-fitting undershirt can create a sloppy or unprofessional look, with excess fabric bunching up or a tight fit that restricts movement. On the other hand, a properly sized undershirt can enhance your outfit by providing a smooth and streamlined silhouette. Additionally, the right size ensures optimal comfort throughout the day, allowing you to focus on your tasks without any distractions. By understanding why undershirt size matters, you can make informed choices that contribute to your personal style and confidence.

What Size Undershirt Should I Wear?

When it comes to determining the size of undershirt you should wear, there are a few key steps to follow:

  1. Measure Your Chest: Start by measuring the circumference of your chest at its widest point. Use a flexible measuring tape and ensure it is snug but not too tight.
  2. Refer to Size Charts: Different brands may have slightly different sizing guidelines, so it's important to consult their size charts. Look for the measurements that correspond to your chest size to find the recommended undershirt size.
  3. Consider Your Body Type: Take into account your body type and personal preferences. If you prefer a more fitted look, you may want to choose a size down from your actual chest measurement. If you prefer a looser fit, you can opt for a size up.
  4. Check for Length and Sleeve Fit: Pay attention to the length of the undershirt as well as the fit of the sleeves. Ensure that the undershirt is long enough to stay tucked in and that the sleeves are comfortable and not too tight or loose.
  5. Try it On: If possible, try on the undershirt before purchasing to ensure the fit is right for you. Pay attention to how it feels on your body and whether it provides the desired level of comfort and mobility.

Remember, finding the right size may require some trial and error, as different brands and styles may fit differently. By following these steps and considering your personal preferences, you can determine the perfect size undershirt that will provide both comfort and a polished appearance.


Common Undershirt Sizing Mistakes to Avoid

Guessing Your Size

Guessing your undershirt size can lead to ill-fitting garments that are either too tight or too loose. Avoid this mistake by taking accurate measurements and referring to size charts provided by the brand.

Ignoring Body Type and Fit Preferences

Not considering your body type and fit preferences can result in undershirts that don't flatter your physique or provide the desired level of comfort. Take into account whether you prefer a more fitted or relaxed fit and choose accordingly.

Neglecting Length and Sleeve Fit

Overlooking the length and sleeve fit of an undershirt can lead to discomfort and an unpolished appearance. Ensure the undershirt is long enough to stay tucked in and that the sleeves provide a comfortable and appropriate fit.

Disregarding Brand Variations

Different brands may have slight variations in sizing, so it's crucial to consult each brand's size chart rather than assuming the same size will fit across all brands. Take the time to check the specific measurements for each brand to find the best fit.

Failing to Try Before Buying

Not trying on an undershirt before purchasing can be a costly mistake. It's essential to try it on to assess the fit, comfort, and overall feel. This allows you to make any necessary adjustments or choose a different size if needed.

By avoiding these common undershirt sizing mistakes, you can ensure a comfortable and well-fitting undershirt that enhances your appearance and confidence.

How Does Undershirt Material Impact Fit?

The material and quality of an undershirt play a crucial role in its overall fit and comfort. Micro Modal, being a popular choice for high quality undershirts, offers breathability, softness, and moisture-wicking properties, making it ideal for everyday wear. It provides a comfortable and relaxed fit that allows for ease of movement. On the other hand, undershirts made from synthetic fibers like polyester or nylon offer stretch and durability, ensuring a snug fit that contours to the body. These materials are often used in athletic or performance undershirts. Ultimately, the choice of material depends on personal preference and the desired level of comfort and functionality for each individual.

Undershirt Size Guide

Chest Measurement (inches)

Recommended Undershirt Size













Please note that this is a general undershirt size guide and may vary slightly depending on the brand. It is always recommended to refer to the specific brand's size chart for the most accurate sizing information.

Should I Wear a V-Neck Undershirt With Dress Shirts?

When deciding whether to wear a v-neck undershirt with dress shirts, it ultimately comes down to personal preference and the style of the dress shirt. V-neck undershirts are a popular choice as they typically remain hidden beneath the collar of most dress shirts, resulting in a neater and more refined appearance. However, if you prefer the traditional crew neck undershirt or if your dress shirt has a wider collar, it may be more suitable to opt for a crew neck undershirt. Regardless of the neckline, it is crucial to ensure that the undershirt has a proper fit, without any excess fabric or visible lines. A well-fitting undershirt should provide a smooth and comfortable base layer that doesn't compromise the fit or look of the dress shirt.

Can a T-shirt Be Used As an Undershirt?

While a t-shirt can technically be used as an undershirt, it may not provide the same level of comfort and functionality as a dedicated undershirt. Undershirts are specifically designed to be lightweight, breathable, and provide a layer of protection between the body and outer clothing. They are typically made from materials that wick away moisture and prevent sweat stains. T-shirts, on the other hand, are often made from thicker fabrics and may not offer the same level of moisture-wicking properties. Additionally, undershirts are designed with a closer fit to ensure they remain hidden under clothing, while t-shirts may have a looser fit. If using a t-shirt as an undershirt, it is important to consider the size and fit to avoid any visible lines or discomfort.

Should My Undershirt Be The Same Size As My Shirt?

Ideally, your undershirt should be the same size as your shirt or slightly smaller. This ensures a proper fit and prevents any excess fabric from bunching up or creating visible lines under your outer shirt. However, it is important to consider the specific fit and style of your undershirt. Some individuals may prefer a slightly tighter fit for their undershirt to provide a more streamlined look, while others may prefer a looser fit for added comfort. Ultimately, finding the right shirt size depends on personal preference and ensuring that it complements the fit and appearance of your shirt without compromising your comfort.

Should My Underwear Color Match My Undershirt?

There is no hard and fast rule that states your underwear color must match your undershirt. The choice of underwear color is primarily a matter of personal preference and style. Some individuals may prefer matching their underwear color to their undershirt for a coordinated look, while others may opt for contrasting colors or simply choose based on comfort. Ultimately, the most important factor is that your underwear and undershirt are comfortable, fit well, and provide the necessary support and coverage. Whether you prefer matching colors or mixing it up, the decision is entirely up to you and what makes you feel confident and comfortable.


In conclusion, finding the right size undershirt is essential for both comfort and style. By following the steps outlined in the undershirt size guide, you can ensure a proper fit that enhances your appearance and provides optimal comfort throughout the day. Avoid common sizing mistakes, consider your body type and fit preferences, and consult brand size charts for accurate measurements. Additionally, understanding how undershirt material impacts fit and making choices based on personal preference can further enhance your overall experience. Whether you choose a v-neck or crew neck undershirt, the key is to prioritize proper fit, comfort, and a polished look. With the right undershirt size, you can confidently tackle your day while feeling comfortable and looking your best.

Final Thoughts

Discover a new standard of comfort with Obviously Apparel's exceptional collection of underwear and undershirts. Our boxer briefs, jockstraps, trunks, and undershirts are thoughtfully crafted to provide unparalleled comfort and support. With a focus on premium materials and meticulous design, each piece offers a luxurious feel against your skin. Upgrade your underwear collection today and experience the ultimate level of comfort with Obviously Apparel.